Re: any emulation docs ?

In article <1187895634.748335.281310@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<zwsdotcom@xxxxxxxxx> wrote:
On Aug 23, 2:42 pm, pau...@xxxxxxx (Paul Schlyter) wrote:


No system ever built, past, present or future, has *full*
documentation.

What you say apply only to real systems, i.e. systems already
implemented in hardware. But kestas wanted to write an emulator of
"any system", i.e. not necessarily any existing system. That makes him
free to invent any system he wants, produce documentation as

I was about to applaud your well-constructed semantic argument when I
realized that I'm still right because of the loophole I built into my
statement: no system ever _built_. Not limited to hardware systems,
either :)

To nitpick: how can something have been _built_ in the future? When
we reach the stage when the system is built, it must be in the past,
right?

The OP can design a system to any arbitrary level of detail on paper,
but as soon as he implements it there will be environmental factors
that push system behavior out of the scope of his design. For example,
the JVM spec is utterly silent on what the JVM should do if every
third byte of RAM is randomly overwritten with the text of the Iliad.

A basic assumption is that the code is supposed to be uncorrupted.
I mean, how are you supposed to read the Iliad if every third letter is
randomly overwritten with the text of Hamlet, translated to some
foreign language?

A more likely situation: what should the JVM do if the power goes out?
As a matter of fact, the JavaCard specification says something about
this, since a SmartCard can be removed from its reader anytime, and
when that happens the power to it goes out.

--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stockholm dot bostream dot se
WWW: http://stjarnhimlen.se/
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